diff --git a/src/deep.js b/src/deep.js
index 953cee3d..e65b4b38 100644
--- a/src/deep.js
+++ b/src/deep.js
@@ -1,5 +1,6 @@
 'use strict';
 
+const util = require('util');
 const Promise = require('bluebird');
 const { mergeAdvanced: merge } = require('object-merge-advanced');
 
@@ -11,6 +12,8 @@ const qu = require('./utils/qu');
 const getRecursiveParameters = require('./utils/get-recursive-parameters');
 const windows = require('./utils/http-windows');
 
+const waitImmediate = util.promisify(setImmediate);
+
 function toBaseReleases(baseReleasesOrUrls, entity = null) {
 	if (!baseReleasesOrUrls) {
 		return [];
@@ -128,6 +131,8 @@ async function scrapeRelease(baseRelease, entitiesBySlug, type = 'scene') {
 		windows.get(pathname)?.close();
 		windows.delete(pathname);
 
+		await waitImmediate;
+
 		logger.debug(`Memory usage after: ${process.memoryUsage.rss() / 1000000} MB (${baseRelease.url})`);
 
 		const scrapedRelease = rawScrapedRelease?.scene || rawScrapedRelease;
@@ -196,7 +201,7 @@ async function scrapeReleases(baseReleases, entitiesBySlug, type) {
 	return Promise.map(
 		baseReleases,
 		async (baseRelease) => scrapeRelease(baseRelease, entitiesWithBeforeDataBySlug, type),
-		{ concurrency: 5 },
+		{ concurrency: 3 },
 	);
 }
 
diff --git a/src/utils/jsdom-perf.js b/src/utils/jsdom-perf.js
index 74336ff3..ed8f70a0 100644
--- a/src/utils/jsdom-perf.js
+++ b/src/utils/jsdom-perf.js
@@ -1,9 +1,12 @@
 'use strict';
 
+const util = require('util');
 const fs = require('fs').promises;
 const Promise = require('bluebird');
 const { JSDOM } = require('jsdom');
 
+const waitImmediate = util.promisify(setImmediate);
+
 async function init() {
 	let peak = 0;
 	const files = await fs.readdir('./html');
@@ -19,9 +22,9 @@ async function init() {
 
 		console.log(`Memory usage: ${usage.toFixed(2)} MB, peak ${peak.toFixed(2)} MB`);
 
-		await Promise.delay(100);
+		await waitImmediate;
 	}, {
-		concurrency: 10,
+		concurrency: 100,
 	});
 
 	await Promise.delay(2000);